Fix building without PAM
Fix building without PAM

Fixes this error in `make`:

    /usr/bin/install: cannot stat ‘epam’: No such file or directory
    make[1]: *** [post-build] Error 1

jgrinstead/yaws,jgrinstead/yaws,jgrinstead/yaws,jgrinstead/yaws,jgrinstead/yaws,jgrinstead/yaws,jgrinstead/yaws